NHTSA complaint #11738129

Owner complaint summary

My Toyota vehicle has a recurring HVAC/air conditioning odor problem that produces a strong vinegar-like or mildew smell from the air vents whenever warmer weather returns and the air conditioning system is used again. The odor is extremely unpleasant and affects the air quality inside the vehicle cabin. The condition repeatedly returns seasonally despite attempts to clean the system. I brought the vehicle to an authorized Toyota dealership for inspection and was told that this issue is “common with Toyotas.” The dealership did not provide a permanent repair and instead recommended spraying a cleaning product into the HVAC system. The cleaner did not resolve the issue, and the odor continues to return. The problem appears related to moisture retention, microbial growth, or contamination within the HVAC evaporator or drainage system. I am concerned about prolonged exposure to contaminated air inside the passenger compartment, especially during regular use of the air conditioning system. Toyota should investigate this recurring HVAC odor condition and determine whether a design or manufacturing defect exists involving the evaporator, condensate drainage, or ventilation system. Owners should not be expected to repeatedly mask the odor with temporary spray products when the underlying issue remains unresolved.